Reply to "D1ZX-9425-DA Ford manifold"

I would think that it very likely would be the 70 Boss 302 carb. It's a vacuum secondary 780cfm.

The 70 428cj carb will work too. It's a vaccum secondary 735.
There were service versions of both and as such are easy installations with the bolt on Pantera throttle adapter bracket.

If you are going to look for one, look for a service version. The original assembly line versions are going to be very expensive now.
I have sold all of my Holleys so I can't help now. I did have all of them at one time.

The 3310-3 is actually a "Universal" aftermarket version (probably early 1980's dated) of the original Chevy Z28 Camaro 780cfm.

It's very similar to the Boss 302 carb. You can probably find a mid 70's dated 3310 or 3310-1AAS one on Ebay if you are patient for between $100 and $150.

There are lots of people that can restore them cosmetically now including re-dying the gold color on the outside and installing new gold cad screws and parts. That shouldn't be a problem.

The vacuum secondary Holley carbs are going to have a MUCH cleaner idle on them then the mechanical secondary "double pump" carbs. Those are calibrated with a heavy idle from Holley since they are intended to be used with "race car" type headers (big primary tubes) which tend to lean the mixture out at the "starting line" when you suddenly WOT the car.

The idle will smart you eyes it's so heavy and you need to know how to go into the idle circuit internally to fix that. I would say also, it is not easy to do.

Any older 3310 is a good choice to work with since it will have period correct looking parts on it and things like new throttle plates are still serviced by Holley. You could in fact build your own once you find the main body with a date code that you think fits.

The few Holley carbs that I have seen on Panteras that were installed by Detomaso are "universal", "Speed Shop" aftermarket carbs but those were installed AFTER the program with Ford ended.

What they did during the program is unpredictable since they would have been in the "Authorized Ford Service Parts" program since that is how Ford paid the dealers by depositing money in their "Parts Account".